Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0f22f2de8c6c50…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 01:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e79890bc56dcc26cf33185b95bf0773 SHA-1: d7f0a6e216a67848a7964745a4bf3dd6c88b8ea7 SHA-256: aa0f22f2de8c6c50e980f84c81fb02da866f15f2159d5d78abbbf2e67fc0fc37
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector URL. The document body text, though heavily obfuscated, contains keywords related to 'basic electrical engineering' and the redirector URL, suggesting a lure to a malicious site. The presence of numerous links to external PDFs indicates a link farm strategy, likely to improve search engine ranking and distribute malicious content.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=basic+electrical+engineering+mittal
    • https://static.usrfiles.com/ugd/217d68_a0fe9af15e5743cdbec58422bb8bd609.pdf
    • https://static.usrfiles.com/ugd/d5d855_d63cfe3274f84812bc47ffd7ac7a2315.pdf
    • https://static.usrfiles.com/ugd/067ecb_ec9f4f21405a4330a19ec224854477f0.pdf
    • https://static.usrfiles.com/ugd/b11f6d_3f39024ac53044ceae93debc603d1281.pdf
    • https://static.usrfiles.com/ugd/3f80ec_917aa8896b514d2a919cd2fa7e0c01df.pdf
    • https://static.usrfiles.com/ugd/39cb9d_d83ae10cf12d4cb88c321e2ee3d25892.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd30a3165401484da617c59abe85d728.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d69e7d67fab432a97d0fad4414a40cc.pdf
    • https://static.usrfiles.com/ugd/067ecb_95a25567a62b419283153219d0423da6.pdf
    • https://cdn.shopify.com/s/files/1/0435/5024/5028/files/oedipus_tyrannus.pdf
    • https://cdn.shopify.com/s/files/1/0436/0844/0995/files/mififunisug.pdf
    • https://cdn.shopify.com/s/files/1/0437/6716/9173/files/35638681759.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046ff.bin
4d3c4956448fb6ef65cb2327eb455a1b5cd768074cb567dfce55ac62ddf0d3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46FF 5168 bytes
font_01_sfnt_off00005871.bin
44d416e003c6a254dfbe55816a78650292d81939ff64e16a21f74e5c88c0242d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5871 11336 bytes
font_02_sfnt_off00007c02.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 16164 bytes

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